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Undercover” To offset drafts #2920754 12/07/19 06:10 PM
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Coda9 Offline OP
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Does anyone have an undercover installed on their grand piano to regulate environment in the room where the piano is located ? The idea sounds ingenious but I don’t like the way it’s supposed to attach underneath the instrument . Also I’m wary of how the undercover material might interfere with the soundboard resonating beneath the piano on the hardwood floor . I would prefer to move the instrument farther at the end of the room so it’s not so in line with the front door opening . Do any of you have experience with this undercover material being fitted underneath your grand piano and does it change the sound ?

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Re: Undercover” To offset drafts [Re: Coda9] #2920781 12/07/19 09:00 PM
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MarkL Offline
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I don't have experience with them, but dampp chaser sells material for an undercover as an accessory to their humidity control system. You can read about it in this product literature.
The description says it's made out of black grille cloth, which is what I use as a cover for the top of my piano to keep the dust off and prevent scratches. I bought mine at the fabric store for about $10. It won't affect the sound because it's intended to be used on speaker grilles. They say it's kept in place with adhesive velcro strips so you can remove it easily. So if you're handy you could probably do this yourself for not much money.


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Re: Undercover” To offset drafts [Re: Coda9] #2920783 12/07/19 09:06 PM
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P W Grey Online Content
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It is intended as an augmentation to a humidity control system. I doubt it will have much of any effect environmentally all by itself. It will not change the humidity fluctuation issue which is what affects tuning stability.

Pwg


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Re: Undercover” To offset drafts [Re: Coda9] #2920787 12/07/19 09:16 PM
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I had one on my grand pianos when I lived/worked in the upper Midwest. It didn’t change the sound.


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Re: Undercover” To offset drafts [Re: Coda9] #2920810 12/07/19 11:43 PM
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Thanks for the report that this undercover material does not affect the sound of the instrument . But I really would rather try relocating the piano in the room first to monitor how that change protects the instrument from being too near the door . I guess I just don’t like the idea of a sticky adhesive going on the wood underneath . I’m located in the East Bay of the SF Bay area . Yes we get fog in the summer but not like San Francisco . Probably I should try checking the surrounding air humidity level with one of those gauges . Right now we’re getting quite a big early rain which is ending tomorrow . The technician is coming early January so I could keep a record of humidity levels .

Re: Undercover” To offset drafts [Re: Coda9] #2920950 12/08/19 12:46 PM
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I am in Orinda. Over the first year or so of owning my piano, I installed (in order, at different times):
- Dampp-Chaser heater bars
- A speaker grill cloth as an undercover (homemade from fabric bought at JoAnne Fabrics, with velcro as the means of attachment to the piano)
- A string cover.

With each addition, tuning stability increased. The combination of all three creates a microclimate around the soundboard that keeps it within about a 5-6% swing in RH (~38% to 44% as measured on top of the iron frame under the stringcover).

Here are a few links to prior posts on this:

http://forum.pianoworld.com/ubbthre...p-chaser-anyone-opposed.html#Post2748783


http://forum.pianoworld.com/ubbthre...-the-best-string-covers.html#Post2509964

Anecdotal, but that has been my experience.


Steve
1990 C. Bechstein M-180

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